dana bash is on capitol hill, where lawmakers were briefed about. give us more details about this threat out of yemen. >> u.s. intelligence agencies have been monitoring this for months we are told. a growing threat stream out of yemen. in recent days, fresh intelligence pointed them to the fact that something may be doing down al qaeda operatives may be in the final stages of planning some sort of attack. yemen also alerting the u.s. to what they believe is the up tick in the threat in their country. they are also on high alert. you are seeing the threat really centered around yemen, but the reaction from the u.s. government is to close embassies throughout the middle east and north africa because they believe at this point it could possibly have deeper ties to al qaeda groups and al qaeda affiliates across the region. >> dana, you're reporting that vice president biden was briefing lawmakers. >> this was a meeting where he took the opportunity to tell members of the congressional leadership in both parties and the ranking members about this threat